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Asked: 2026-05-21T20:57:35+00:00

List item I use following Regex to validate a string ^[a-zA-Z0-9-/]* private static void

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  • List item

I use following Regex to validate a string ^[a-zA-Z0-9-/]*

    private static void ValidateActualValue(string value)
    {
        if (String.IsNullOrEmpty(value)) throw new ArgumentNullException("value");
        if (Regex.IsMatch(value, (@"^[a-zA-Z0-9-/]*")))
        {
            throw new InvalidBarcodeException(value);
        }
    }

The following string should be allowed string correctBarcodeString = “1-234567890/A”;
However there’s still an exception thrown.

Allowed values should be:

  • 1234234545689889097
  • A-adf90923409/1234
  • aaaaaaaAAA
  • BC-9876655788
  • BC-345/q3435/wqer
  • ABC-/BCD
  • etc.
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1 Answer

  1. Editorial Team

    Inside a character group the - has to be at the beginning or at the end, otherwise it has to be escaped.

    So change it to

    "^[a-zA-Z0-9/-]*"

    Edit:

    I would also suggest an anchor at the end of the regex, otherwise it will also match as long as the first part is valid.

    "^[a-zA-Z0-9/-]*$"

    if you want to avoid matching the empty string then use + instead of *. Or if you know a valid Min/Max Range for the length use {4,20}, if the minimum amount of characters is 4 and the maximum is 20.

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